Headset Wireless specification: Wireless V4.2 JL hence A2DP, AVRCP, HSP, HFP protocols support.Transmission range is 10 meters which is certainly very convenient.Charging voltage: DC5V. Charging time about 2 hours, talk time 3.5 hours, music time 3.5 hours, while standby time is 90 hours or more.Battery capacity: 80mAh. Speaker size: 14mm. Weight only 21g therefore you can workout without any burden.Finally, battery display for Apple phones and some Android phones will allow you to check power level and charge on-time.